Ionic Charges and Polyatomic Ions

The video tutorial explains how to write dissociation equations for ionic compounds. It begins with a simple example using sodium chloride, highlighting the importance of knowing the charges of ions. The tutorial then covers ammonium bromide, emphasizing the concept of polyatomic ions. It proceeds with examples of calcium nitrate and magnesium iodide, explaining the charges of alkaline earth metals. Additional examples include calcium chloride, sodium carbonate, potassium phosphate, and barium hydroxide. The video concludes with aluminum sulfate and a problem involving an unknown metal, demonstrating how to determine the charge of ions using equations.

What charge does sodium typically have when it forms an ion?

• +1

• +2

• -1

• -2

Which of the following is a polyatomic ion that cannot be broken apart?

• Bromide

• Sodium

• Chloride

• Ammonium

What is the charge of a nitrate ion?

• -2

• +2

• -1

• +1

How many chloride ions are present in calcium chloride?

• Three

• Four

• Two

• One

What is the charge of a carbonate ion?

• +1

• -2

• +2

• -1

How many potassium ions are needed to balance one phosphate ion?

• One

• Two

• Four

• Three

What is the charge of a hydroxide ion?

• +1

• -1

• +2

• -2

What is the charge of an aluminum ion in aluminum sulfate?

• +4

• +3

• +2

• +1

In the compound M3(PO4)4, what is the charge of the unknown metal ion if phosphate has a charge of -3?

• +1

• +2

• +4

• +3

What is the total charge of the sulfate ions in aluminum sulfate?

• -2

• -8

• -4

• -6